263557428723 has 16 divisors (see below), whose sum is σ = 411005737600. Its totient is φ = 166457323080.

The previous prime is 263557428707. The next prime is 263557428727. The reversal of 263557428723 is 327824755362.

263557428723 is a `hidden beast` number, since 2 + 6 + 3 + 557 + 4 + 2 + 87 + 2 + 3 = 666.

It is not a de Polignac number, because 263557428723 - 2⁴ = 263557428707 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 263557428723.

It is not an unprimeable number, because it can be changed into a prime (263557428727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 256878073 + ... + 256879098.

It is an arithmetic number, because the mean of its divisors is an integer number (25687858600).

Almost surely, 2^263557428723 is an apocalyptic number.

263557428723 is a deficient number, since it is larger than the sum of its proper divisors (147448308877).

263557428723 is a wasteful number, since it uses less digits than its factorization.

263557428723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513757199 (or 513757193 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 54.

The spelling of 263557428723 in words is "two hundred sixty-three billion, five hundred fifty-seven million, four hundred twenty-eight thousand, seven hundred twenty-three".